Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3523a61667ab925…

MALICIOUS

PDF

116.1 KB Created: 2020-12-20 07:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 361aa20ae2517b3b5dd3abe57a56f52e SHA-1: 78e9fa08f04750a77bf978e0367b5a67a63dc9d7 SHA-256: f3523a61667ab925ba7be51d786614942d1fd3cafa160563f347a922fb64df00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded external links, with a specific heuristic identifying it as a potential link farm. The ClamAV detection and ML classifier also indicate maliciousness, flagging it as a phishing trojan. The presence of external URIs suggests an attempt to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffking.ru/123?utm_term=i+can+see+your+voice+season+3+cast
    • https://xujupemixupu.weebly.com/uploads/1/3/4/7/134745759/4401694.pdf
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5f8c801c282b6.pdf
    • https://cdn-cms.f-static.net/uploads/4413236/normal_5fc011dbbb3ba.pdf
    • https://cdn-cms.f-static.net/uploads/4426550/normal_5fc1c032dcacb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/74a6af82-bc85-4368-8392-43926da2401b/telaxinotaf.pdf
    • https://static1.squarespace.com/static/5fce2dc706af1e3f448c2ec4/t/5fd65cc7154d727871eaa6a8/1607883977723/72799268359.pdf
    • https://uploads.strikinglycdn.com/files/c40bc82b-a74a-4f49-a3bb-cc1ccdd8e8fa/69819774984.pdf
    • https://uploads.strikinglycdn.com/files/7f948de3-2170-4a16-b1f9-4ac248da38d3/xetaralugopuvirupenogo.pdf
    • https://static1.squarespace.com/static/5fc0d92f11f6a4198485658d/t/5fc3ed44fa04221c719926b7/1606675781366/twilight_forest_wiki.pdf
    • https://uploads.strikinglycdn.com/files/b45b657a-575c-4a2b-8c29-2dbc496e418d/jamibotadobodakal.pdf
    • https://uploads.strikinglycdn.com/files/967b3130-da64-44e2-b30a-17d666ba58f4/cartoon_drawing_human_body.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf579d3570fb44d1f9bc5c/1606375326085/a_cell-a-bration_worksheet_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018c74.bin
d9dea855d7d74c6db1a1ceb66cd6b54284cecb569a01767a02a20bc5d56863b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C74 5024 bytes
font_01_sfnt_off00019da8.bin
ccf8661024930c28ff0c65781a0a53cb188cbc522c11f35a1b52393800725bd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x19DA8 11144 bytes